US PATENT SUBCLASS 454 / 296
.~.~.~ Including perforated or porous element

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
284  DF  .~ Including specific air distributor (e.g., register, etc.) {14}
292  DF  .~.~ Ceiling type {4}
296.~.~.~ Including perforated or porous element {1}
297  DF  .~.~.~.~> Having portion or element movable during normal use {1}

DEFINITION

Classification: 454/296

Including perforated or porous element:

(under subclass 292) Subject matter wherein the air directing means includes a component either (1) having a plurality of air passing holes cut or formed in it or (2) formed from an air permeable material.

(1) Note. While the panel need not be in a single plane (e.g., it may undulate), the holes themselves, when formed or cut, do not extend beyond the surface of the surrounding panel taken as a whole. For example, they do not form nor do they support projecting nozzles or form louvers with projecting air directing slat portions which are above the adjacent panel surface.